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Question

Gangue particles can be removed from cassiterite ore by the process of _______.


A

calcination

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B

magnetic separation

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C

gravity separation

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D

roasting

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Solution

The correct option is B

magnetic separation


Electromagnetic separation is used to separate magnetic ore particles from non-magnetic impurities (or vice versa), wherein electromagnets present in the rotor attracts magnetic ores and forms a separate heap than the impurities. Tin stone (also known as Cassiterite) contains SnO2 (non-magnetic) and Wolframite, FeWO4 (magnetic) and is concentrated by this method.


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